Rotary pump



Dec. 26, 1939. Q H. 'R. PALMER 2,184,753

' ROTARY PUMP Filed Sept. 1, 1937 4 Sheets-Sheet 1 I 1 I I a Z I v INVENTOR. fl. 424W BY ATTORNEYJ.

H. R. PALMER ROTARY PUMP Filed Sept. 1. 1937 Dec. (26, 1939.

4 Sheets-Sheet 3 Z w 3 2 a a .a I. \.\LM\\ 4 a Z Z fl a 5 a w 2 H a IIQVENTQR.

ATTORNEYS Dec. 26, 1939. r H. R.IPALMER I 2,184,7

ROTARY PUMP Filed Sept. 1, 1937 4 Sheets-Sheet 4 ATTORNEYS INVENTOR;

Patented Dec. 26, 1939 UNITED STATES PATENT OFFICE ROTARY PUMP Herbert R. Palmer, Cleveland, Ohio Application September '1 Claims.

This invention relates to rotary pumps of the type wherein a blade, carried jointly by a revolving cylinder and a rotary piston within said cylinder, is employed for the purpose of pumping It is the general purpose and object of my invention to provide a pump of this character which is particularly eflicient in operation while simple in construction and economical of produce it) tion. Further and more limited objects of the invention are to improve the means by which the fluid is supplied to and delivered from pumps of this character; also to provide improved means for lubricating the guides for the sliding blades 15 of such pumps.

Further and more limited objects of the invention will be set forth hereinafter in connection with the description of the views shown in the drawings, wherein Fig. 1 represents a central m longitudinal vertical sectional view through a rotary pump embodying my invention; Fig. 2 a longitudinal horizontal sectional view; Figs. '3, 4 and 5 are sectional views corresponding respectively to the lines 33, l-J and 55 of Fig. 1, the delivery portion of the passage supplying fluid to the cylinder being shownin dot-and-dash lines in Fig. 3; Figs. 6, '7 and 8 are views similar to Fig. 3, showing the positions of the cylinder, piston and supply and exhaust ports at diflerent stages in the revolution of the piston and cylinder. The pump disclosed herein comprises generally a casing or housing. for the rotary piston-and cylinder, which is provided with an external hear ing for the cylinder and with an internal bearing for the shaft which drives the piston and cylinder; a rotary piston and a clylinderconnected to said shaft;. a blade mounted in the'rotary piston and having one end pivotally connected to the cylinder; means for supplying a fluid to and exhausting the same from the space between the piston and cylinder; means for lubricating the piston blade; and means for rotating the said shaft.

'The housing comprises a cylindrical wall pl having a head 2 formed therewith, and a removable head or cover plate 3 detachably secured to- .thecylindrical wallas by means of lugs l and bolts'i. The cylindrical wall of the housing is shown as provided with heat-radiating flns 6. and the heads are provided with legs I having feet 8 by which the pump may be conveniently supported upon any suitable foundation. The heads 2-:and 3 are provided each with a cylindrical bearing member 9 in which the drive shaft c5 10 is journaled. The drive shaft is connected directly to and preferably cast with the opposite sides of therotary piston ll located with nthe cylinder ii, the cylinder being driven in turn by the piston through the blade. which is slidably mounted in a guide slot formed in the piston.

1, 1937, Serial No. 181,938

The cylinder is conveniently made in two parts, the first part comprising the cylindrical wall It" having a head l2 formed therewith, while the other part comprises the head Iii which is secured to the adjacent end of the wall I2 as by means of lugs l3 and bolts It. The heads of the cylinder are provided with journals l2 and l'i by means of which the cylinder is mounted on the bearing members 9, concentrically therewith. The piston is provided with a guide slot i8 extending thereinto and across the axis thereof, the said slot being T-shaped with the outer end thereof extending the full length of the piston. This guide slot receives therewithin the sliding piston blade IS, the outer end i whereof is formed into a pintle, by means of which the blade is pivotally supported within a cylindrical seat or socket ll projecting outwardly from the wall I: of the cylinder. This blade, as will appear particularly from Fig. 1, is also substantially T- shaped, and the outer widened end of the guide slot i6 and the narrow inner end of said slot are of such length as to accommodate the reciprocation of the piston blade due to the rotation of the rotary piston and cylinder.

In order" to secure a balanced construction, the cylinder is provided with an extension i8 diametrically opposite the socket portion l1, said extension constituting a counterbalance for the socket extension. It will be noted that the pintle I 5 is connected to the body of the blade by a comparatively narrow tapered neck portion Li and that the cylindricalportion of the pintle is of greaterangular extent than its seat, there being sufllcient clearance between the sides I! of the neck and the sides ll connecting the socket portion of the cylinder with the interior of the main body thereof to accommodate all rocking movements of the piston blade during each revolution of the piston and cylinder.

The construction by which fluid is supplied to and::exl iausted from the-cylinderwill now be described. .One of :the end walls or heads of the housing is provided with an inlet port l9 whichextends inwardly to the bearing member 9 at such end, where it communicates with a passage It formed in and extending longitudinally of the said bearing member, the passage l9 communicating in turnwith an annular passage l9 surrounding the said bearing, within the hub or inurnaiii of the adjacent cylinder head, and thence longitudinally through the wall of said journal and into a port l9 therein which in turn communicates with the cylinder on one side of the blade it. The opposite bearing member is provided with an annular passage 20', similar to the passage l9," and communicating with the cylinder through the port 20, on the opposite side of the blade l5 from the port l9. The passage 20'' in turn communicates with the passage similar to the passage l9, and the passage 20 in turn with the delivery port or passage 20 formed in the head 2.

I employ the following construction for'lubrication of the piston blade. In practice, the housing will be nearly filled with oil. As the cylinder rotates therein, oil may seep or pass by capillary action between the outer ends of the journals of the cylinder and the housing heads and may enter the passages 22 and 22 and be delivered into the cylinder adjacent to opposite ends of the guide slot through passages 2i and 2 I formed within and extending longitudinally of the opposed bearing members 9, 9 respectively.

However, as very small tolerances may be provided between the ends of the cylinder journals and the housing heads, I prefer to provide restricted channels 22 and 22 in the heads, the said channels communicating respectively with the interior of the housing and with the passages 22, 22. The oil delivered to the opposite sides of the piston blade escapes into the cylinder,

being thrown by centrifugal action against the inner wall of the same and is permitted to be discharged therefrom into the housing by a channel 15 which is provided in the pintle IS, on the exhaust side of the said blade, and from said channel through a port ll in the socket I! and which port is adapted to register with the channel when the parts are in the position shown in Fig. 8, the port being closed in the other positions of the rotor and piston shown in Figs. 3, 6 and 7.

The space between the end of the journal i2 and the adjacent housing head 3 is provided with washers 23 having a washer 24 interposed therebetween. The first mentioned washers are preferably of steel, while the interposed washer is made of a synthetic rubber compound known to the trade as Duprene.

It will be noted that one end of the rotary piston, in conjunction with the ports l9, l9, I9 and I9, controls the supply of fluid to the cylinder and that the opposite end of the piston, in conjunction with the ports 20, 20 20 and 20, controls the exhaust fluid from the cylinder.

The operation of my pump will now be explained by reference to Figs. 3, 6, '7 and 8, which show the relative positions of the rotary piston, blade, cylinder, and supply and exhaust ports at successive angular positions of the drive shaft, the angular distance of the shaft between two successive positions being are shown in the positions which they occupy when the blade is projected the greatest distance beyond the piston, due to the eccentric mounting of the shaft within the bearing members carried by the housing heads. In this position both the supply and the exhaust ports l9, 2ll are fully open and the spaces on opposite sides of the blade for supply and exhaust fluid are equal.

In Fig. 6, the parts are shown in the positions which they occupy when the rotary piston has been turned a quarter revolution in a counterclockwise direction. In this view, the fluid'on the exhaust side of the blade has been almost entirely exhausted and the exhaust port 20 has been nearly closed by the rotary piston. In the meanwhile, the inlet port l8 has been opened and a large space has been provided for the fluid supplied therethrough. It will be noted that, while the rotary piston has been turned only a quarter revolution, the cylinder has moved a quarter revolution plus the distance, indicated at C, between a horizontal line extending from the axes of the bearing members and the center of the In Fig. 3, the parts pintle i5, which is on a horizontal line extending from the axis of the shaft.

When the rotor has been turned another quarter revolution, to the position shown in Fig. 7, the blade will then be in its fully retracted position within its guide slot, both ports i9 and 20 will'be closed, and the cylinder will contain the maximum possible amount of fluid. In this view, the rotary piston has again traveled a distance of 90, while the cylinder has traveled a distance of 90 less the distance 0, the axes of the rotor shaft and of the bearing members then being on the same vertical line.

As the piston turns another quarter revolution, as shown in Fig. 8, the inlet port I 9 will begin to open while the exhaust port will be completely opened. At this point, while the piston has traveled a distance of 90, the cylinder has traveled a distance of 90 less C.

As the rotor completes its revolution in traveling from the position shown in Fig. 8 to the position shown in Fig. 3, the inlet port will have been fully opened and the space for inlet fluid will have been increased, while a. large part of the exhaust fluid will have been delivered through the port 20, which is still open. In reaching this position, the rotary piston will have traveled a distance of 90, while the cylinder will have traveled a distance of 90 plus C.

I have found that a pump constructed in accordance with my invention has proved particularly efllcient in operation and especially as regards the mode of supplying fluid to and exhausting the same therefrom; also that the blade is efficiently lubricated; and that, finally, these important results are obtained in a construction which comprises a minimum number of parts and which is economical of production. Practically all of the parts can be made as castings. The housing and the rotary piston will preferably be of cast iron, the cylinder of bronze, and the piston blade and shaft of steel.

iHaving thus described my invention, what I claim is:

1. In a pump, the combination, with a lubricant-containing housing having opposed heads and bearings carried by said housing, of a shaft mounted in said bearings eccentrically thereof, a rotary piston secured to said shaft and rotatable therewith, a cylinder having heads and journals extending from said heads toward the housing heads and having its cylindrical wall in proximity to the bottom of said housing, said journals being mounted on said bearings concentrically therewith, a blade recinrocably mounted in said piston, means pivotally connecting one, end of said blade with said cylinder, means for rotating said shaft, means controlled by the rotation of the piston for supplying fluid to and for exhausting the same from the cylinder, and means for supplying lubricant from thehousing to the mounting for said blade, said means comprising restricted channels formed between the ends of the cylinder journals and the adjacent heads of the housing, the receiving ends of the said channels communicating with the interior of the housing and the delivery ends of said channels communicating with passageways formed within the said bearings, the said passageways having their delivery ends com municating withopposite sides of the mounting for said blade.

2. In a pump, the combination, with a lubricant-containing housing having opposed heads and bearings, of a shaft mounted in said bearings eccentrically thereof, a rotary piston secured to with and having its cylindrical wall in proximity.

to the bottom of said housing, said piston being provided with a guide slot therein, a blade reciprocably mounted in said slot, a pivotal connection between the-outer end of said blade and the said cylinder, inlet and exhaust ports located in the opposite heads of said cylinder, respectively, and on opposite sides of and adjacent to said blade, means operated by the rotation of the said piston for controlling the supply of fluid-to the cylinder through the inlet port and the delivery of fluid from the cylinder through the exhaust port, and

meansfor supplying lubricant from the housing to said guide slot, said means comprising restricted channels formed between the ends of the cylinder journals and the adjacent heads of the housing, the receiving ends of the said channels communicating with the interior of the housing and the delivery ends of said channels communicating with passageways formed within the said bearings, the said passageways having their delivery ends communicating with the opposite sides of the said guide slot.

3. In a-rotary pump, the combination, with a lubricant-containing housing having heads, of a bearing carried by each of said heads, a shaft mounted in said bearings eccentrically thereof, a rotary piston connected with said shaft, a cylinder in said housing enclosing saidpiston and having journals mounted on said bearings, the said piston having a slot extending thereinto, a blade mounted in said slot in sliding engagement with the opposite heads of said cylinder, and means for supplying lubricant from the said housing to the cylinder in operative relation to the said guide slot, the said means comprising passages formed in the said bearings and having their delivery ends extending through the cylinder heads in operative relation to opposite ends of the said guide slot and having their receiving ends communicating with passages formed in the heads of the said housing, the last mentioned passages having their receiving ends communicating directly with the said housing.

4. In' a rotary pump for aeriform fluids, the

combination; with a housing. of bearings carried.

by said housing, a shaft mounted in said bearings eccentrically thereof, a rotary piston connected with said shaft, a cylinder in said housing enclosing said piston and having journals mounted on said bearings concentrically therewith, the said piston having a slot extending thereinto, a blade 'pivotally connected at one end with the said cylinder and mounted in said slot in sliding engagement with the opposite heads of said cylinder, and meapsfor lubricating the said blade, said means comprising passages formed in the bear-' ings adapted to receive lubricant from the housing and to deliver the same to the said slot and a port on the exhaust side of the said piston blade and controlled by the rocking thereof for permitting the lubricant supplied to said slot to be delivered, at a predetermined point in the rotation of the cylinder and piston, by centrifugal action from the cylinder into the housing.

5. In a rotary pump for aeriform fluids, the combination, with a housing, of bearings carried by said housing, a shaft mounted'in said bearings eccentrically thereof, a rotary piston connected with said shaft, 9. cylinder in said housing enclosing said piston and having journals mounted on said bearings concentrically therewith, the

said piston having a slot extending thereinto, a

blade pivotally connected at one end with the said cylinder and mounted in said slot in sliding engagement with the opposite heads of said cylinder,

and means for lubricating the said blade, said.

means comprising passages formed in the bearings and each adapted to receive lubricant at one end thereof from the said housing and having their heads in operative relation to opposite ends of the said guide slot respectively and a port on the exhaust side of the said piston blade and controlled by the rocking thereof for permitting the combination, with a housing, of bearings carried by said housing, a shaft mounted in said bearings eccentrically thereof, a rotary piston connected with said shaft, a cylinder. in said housing enclosing said piston and having journals mounted on said bearings concentrically therewith, the said piston having a slot extending thereinto, a blade reciprocably mounted in said slot, the cylinder having a bearing socket projecting outwardly from the cylindrical wall thereof and the blade having a cylindrical pintle mounted in said socket, and means for lubricating the said blade, the said means comprising a passage formed in the bearings and adapted to receive lubricant at one end thereof from the said housing and having its delivery end extending through a cylinder head in by said housing, a shaft mounted in said bearings eccentrically thereof, a rotary piston con-' nected with said shaft, a cylinder in said housing enclosing said piston and having journals mounted on said bearings concentrically therewith, the said piston having a slot extending thereinto, a blade reciprocably mounted in said slot, the cylinder having'a bearing socket projecting outwardly from thecylindrical wall thereof and the biade'having a cylindrical pintle mounted in said socket, and means for lubricating the said blade, the said means comprising passages formed in the bearings each adapted to receive lubricant at one --end thereof from the said housing and having their delivery ends extending through the cylinder heads in operativerelation to opposite ends of the said guide slot, respectively, a port in .said socket on the exhaust side of the said piston blade, and a channel in the pintle communicating at one end with the cylinder on the exhaust side of said blade and adapted to communicate at its opposite end with said port at a predetermined point in the rotation of the cylinder and piston.

HERBERT R. PALMER.

.delivery ends extending through the cylinder 

